The Ten Books on Architecture, 7.13.3

Vitruvius  translated by Joseph Gwilt

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3After the shells are gathered they are broken into small pieces with iron bars; from the blows of which, the purple dye oozes out like tears, and is drained into mortars and ground. It is called ostrum, because extracted from marine shells. Inasmuch as this colour, from its saltness, soon dries, it is prepared for use with honey.

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